Harrow



(Nolldel.) 2 Sheets-Sheet 1.

C. La DOW. Harrow.

No. 233,777. Patented oct.. 26,1880.

N. PETERS. Phommnocmmik. wAsmrmroN. C.

(No Model.) v2 sheetsf-sneen 2.

C. La. DOW.

Harrow.

No. 233,771. Ptented oct. 26, 1880.

N. PETERS. PHOTOvUTMDGRAPMER, WASHINGTQN. D. C.

Unire dramas CHARLES LA DOV, OF ALBANY, NEW YORK.

HARROW.

SPECIFICATION forming part of Letters Patent No. 233,777, dated October 26, 1880. Application tiled Jufy 13, 1880. (No model.)

To all lwhom tt may concern Be it known that l', CHARLES LA Dow, a citizen of the United States, residing at Albany, New York, have invented new and uset'ul Improvements in H arrows, ot' which the following is a specitication.

This invention relates to that class of harrows having spring-teeth which are adjustable t'or the purpose of regulating their depth ot' penetration and degree ot' vibration on the soil, its objects being to vary the angle of the workingfaces of the teeth with reference to the line ot' draft and to facilitate the drawing ofthe harrow from place to place when not in use.

In the accompanying drawings, Figure 1 is a plan view of aliarrow constructed according to my invention. Fig. 2 is a section on liner a; ot' Fig. l. Figs. 3, 4, 5, 6, 7, 8, 9, and 10 are detail views ot" various parts of the harrow.

The letters A B designate, respectively, the two sections of a barrow-frame, each being composed oi' two beams, A and B', diver-ging rearwardly, and connected by an oblique brace, a, adjustable by holes, as shown in the drawings. The two sections are connected together by eyebolts c, in order that the frame may have proper iiexibility to work efficiently upon uneven ground.

The letter C designates the tooth bars, mounted in the frame-sections with their outer ends inclined rearwardly, and upon these bars are secured the spring barrow-teeth D. These teeth are formed on a volute curve and preferably made of spring-steel--say aboutt'our feet in length, two inches in width, and one-fourth of an inch in thicknesswith points triangular, or similar to those of ordinary cultivatorteeth, formed at their outer ends. Each tooth is fastened to its bar by having its inner en d placed against a fiat seat formed on the under side of said bar C, as shown clearly in Fig. 9, and a bolt, d, passed through the tooth and bar. Normally the tooth touches the opposite edges only of the seat, but when strained toward the bar by the bolt it will be drawn snugly against the whole face of the seat, and its tension will prevent it from wearing loose. Each tooth is re-enforced by a stirrup, d', secured to the top of the tooth-bar by means of the toothbolt and its nut, and embracing the curved inner portion ot' the tooth, as illustrated in Figs. 5, 9, and l0.

Each ot' the tooth-bars G is provided at its inner end with a bracket, e, secured to the bar by means of a socket, o,.and through a hole in the cross-bar ot' this bracket passes the. rearwardly-inclined portion j ot' a bolt, f, which passes transversely through the bar B', as in Fig. 7. The bolt is ot a considerably less diameter than the hole in the bracket, in order that the bar may be swung laterally, and on lthe screw-threaded end ot' the bolt, within the bracket, is litted a nut larger than the hole, to secure the bracket and bolt together. This construction admits ot' the rocking otthe toothbars back or forward atwill.

Between the bracket and the bar Bis arranged a wedge-shaped elastic seat, g, which prevents bumping ot' the bracket against the bar, and also permits the angle which the bracket forms with the beam to be varied.

Each ot' the bars C is connected to the outer beam, A', by means ot' an adjustable bearing, h, Figs. tand 5, the latter being an under-side view. This hearing is provided with the ears h', having segmental slots h2 formed therein, so that their position on the beam can be readily changed to permit the rearward inclination ot' the tooth-bars to be changed.

It the ground be well broken and soft, the tooth-bars should be arranged to present the faces ofthe teeth at nearly right angles to the draft, but it' the ground be covered with large hard clods or stones, the'tooth-bars should be inclined rearwardly sufficienti y to present the faces ofthe teeth at such angles to the line of draft as will enable them to throw outwardly the stones, refractory clods, or other obstructions with which they may come in contact.

Each ot' the tooth-bars G is provided with a radially-projecting arm, E, secured. to said bar by a shackle, Z, to the upper half, l', ot which the arm is directly attached, and preferably formed in one piece therewith, the two halves Z and Z2 embracing the bar and secured together by bolts. The interior curved faces of the shackle are corrugated to iit upon a similarly-corrugated portion of the bar, as shown in Figs. 2 and 3, in order to give the said shackle a firm hold upon the bar.

IOO

The upper ends of the arms E are connected by a bar, F, which terminates at its rear end in a rigidly-attached toothed segmental plate, Gr, through which passes the pivot connecting it and the bar to the rear arm, E. The rear arm, E, is prolonged to form a lever, H, carrying a spring-bolt, Hf, connected by a rod or chain with a handle, H2, at the top of the lever. The spring-bolt H engages the teeth of the segment G, and holds the lever thereto. By means of the lever II, and through the segmental plate, bar F, and arms E, the tooth bars may be simultaneously turned to vary the penetration of the teeth, as indicated in dotted lines. By this arrangement it will be seen I dispense with any fixed cross-bar for carrying the locking devices, and thus cheapen and simplify the construction of the implement. By. this arrangement the teeth are also rendered more or less vibratory and yielding, according to the work to be done. Vhen working among stones or stumps they should be set so that they will yield more than when on smooth land. The bars maybe turned not only to vary the penetration of the teeth, but may be given such a movement as to bring the teeth with their convex main portions under the frame, and may be thus locked, in order to serve as runners upon which the implement may be hauled from place to place, thus avoiding the labor of turning the frame upside down, as heretofore. From a point near the top of each ot' the arms E there projects laterally a stud, t', which tits through a hole in the bar F, and said stud is bored for the passage of the bolt t", the head ot' which secures the bar F upon the stud, and thus the bolt is relieved of lateral strain.

The rear tooth-bar, C, of the frame-section A, it will be observed, has but three teeth, the same as the othersand if the rear bar of section B had also only three teeth there would be left a considerable space at the center of the harrow where the ground would not be properly worked; but to avoid this I provide the rear bar of the section B with four teeth, and to make room for the inner tooth I shorten the beam B of the section, so as to allow the inner end of the tooth-bar to extend past-its end. Rearwardly from the inner surface of this shortened beam extends a plate, b, provided with a hole to receive a journal-pin proiecting from the tooth-bar. rI'he inner tooth of this bar is at about equal distances from those on each side of it, and lills the gap Which would be left it' the bars had a uniform number of teeth.

having a length about equal to the width of 6o the front of the frame. rlhe ends of this bar are connected to the opposite front corners of the frame by means of chains t, and from its middle a link, t', leads to the inner corner of one of the frame-sections-in this instance, the section B, but it is not material which. rllhis draft-bar being thus connected to the harrow at three points equal distances apart, and the outer two connections being at the corners of the frame, the draft will be applied equally at all times, its tendency being to prevent lateral vibration of the harrow 5 but even during such vibrations as maybe caused by uneven ground the draft will be equally distributed between the near and od horses.

Having now fully described my invention, I claiml. The combination, with the flexibly-connected harrow-frame sections, of the toothbars having their outer portions mounted in adjustable bearings supported by the outer beams and their inner ends liexibly jointed to the inner beams, substantially as and for the purpose set forth.

2. The combination ot' the tooth-bars C,l

having formed therein tlat seats for the teeth, of the curved teeth having their curved elastic inner ends arranged to bear normally on opposite edges of said seats, and the bolts passing through said bars at about the centers of the seats and through the curved inner ends of the teeth, substantially as and for the purpose set forth. l

3. The combination, with the tooth-bars G, having the tlat sprii'ig-seats and curved teeth D secured thereto, ofthe stirrups d', attached to the bars embracing the teeth, and arranged to brace said teeth against outward strain, substantially as and for the purpose set forth.

4. The combination, with a barrow-frame, of rotary tooth-bars provided with curved teeth capable of adjustment simultaneously to form runners upon which the harrow may be hauled from place to place, substantially as set forth.

ln testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

CHARLES LA DOW.

IVitnesses:

GEO. C. LEE, JNO. A. WoLFF. 

